CN102364762B - Leakage protection plug - Google Patents
Leakage protection plug Download PDFInfo
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- CN102364762B CN102364762B CN 201110225873 CN201110225873A CN102364762B CN 102364762 B CN102364762 B CN 102364762B CN 201110225873 CN201110225873 CN 201110225873 CN 201110225873 A CN201110225873 A CN 201110225873A CN 102364762 B CN102364762 B CN 102364762B
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- ground wire
- weak current
- inductor
- zero line
- protecting plug
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Abstract
The invention discloses a leakage protection plug, which not only can prevent electrical shock caused by electrical equipment faults, but also can prevent electrical shock caused by accidental electrification of an earth wire. The leakage protection plug is also provided with a weak electric current detection sensor, wherein a primary winding and a secondary winding of the weak electric current detection sensor are insulatively separated and are both wound on an iron core of the weak electric current detection sensor, a detection circuit formed by connecting the primary winding and a flow resistance capacitance resistance element in series is connected between the earth wire and a zero line, a second amplification circuit is also arranged in a drive circuit of an electromagnetic coil, a zero sequence current mutual inductor and an output end of the secondary winding of the weak electric current detection sensor are respectively connected with input ends of a first amplification circuit and the second amplification circuit in parallel, trigger output ends of the first amplification circuit and the second amplification circuit are respectively connected with a diode in series and then are connected with silicon controlled trigger electrodes, and a silicon controlled anode and a silicon controlled cathode are respectively connected with an anode and a cathode of an output end of a rectification circuit.
Description
Technical field
The present invention relates to Electrical Safety resist technology field, especially relate to a kind of leakage protecting plug.
Background technology
Chinese patent literature CN1142618C discloses the leakage protecting plug that a kind of ground wire can open and close, not only be provided with zero sequence current mutual inductor that phase line and zero line all pass on this leakage protecting plug, also be provided with the ground wire electrified detection inductor that ground wire passes, therefore it not only can detect between load end phase line and zero line and have or not residual current, when occurring residual current between phase, zero line and reaching the threshold values that presets (for example: 10mA), it will be threaded off immediately, cuts off phase line, zero line and ground wire; And when the ground protection system exception causes the ground wire accident charged; it can also detect the load end ground wire the zero accident electric current; (for example: 10mA), it also can be threaded off immediately, cuts off phase line, zero line and ground wire when ground wire unexpected electric current occurs and reaches the threshold values that presets.
as from the foregoing, existing leakage protecting plug is exactly the load end phase in the electric leakage of load end fault or the unexpected precondition that can thread off when charged of ground wire, must have between zero line and must have a mind to extrinsic current on residual current or load end ground wire and flow through and to thread off, so just there is following defective in existing leakage protecting plug: during use, no matter be when ground protection system's ground wire disappearance (for example: the virtual connection of socket ground wire causes without ground connection) and the electric leakage of leakage protecting plug load end consuming device insulation fault, or at the ground protection system exception (for example: phase line, when earth short) causing the ground wire accident charged, dangerous voltage on the exposed metal parts band of consuming device is caused in the capital, but they all do not consist of the loop thereby also do not produce the unexpected electric current of residual current or ground wire, so, although consuming device exposed metal parts have been with dangerous voltage, but existing leakage protecting plug can not threaded off in this case automatically, only have when human body or livestock touch these band power on the exposed metal parts time, just form the loop through human body or livestock, thereby producing the unexpected electric current of residual current or ground wire threads off and phase line leakage protecting plug in 0.1S, zero line, ground wire disconnects, although in time threading off, it has protected the life security of people or livestock, but existing leakage protecting plug be in this case must be first by human body or livestock get an electric shock produce residual current or the unexpected electric current of ground wire and flow through human body or livestock after, it could be threaded off phase line, zero line, ground wire disconnects, so existing leakage protecting plug still can cause the electric shock accidents of human body or livestock.
Summary of the invention
the object of the present invention is to provide a kind of leakage protecting plug that can overcome above-mentioned existing leakage protecting plug defective, it not only can be in the load end phase, the zero line road occurs that electric leakage or load end ground wire meet accident can be in time the phase line contact when charged, zero line contact and ground wire contact all disconnect, and it when the ground protection system ground connection disappearance (for example: the virtual connection of socket ground wire causes without ground connection) and the electric leakage of leakage protecting plug load end consuming device occur and causes on the electric appliance casing band dangerous voltage or ground protection system abnormal can also will automatically thread off before people or livestock touch consuming device when causing the ground wire accident to be with upper dangerous voltage, in time phase line, zero line and ground wire disconnect, for people provide the higher leakage protecting plug of reliability and better Electrical Safety guarantee, and saving cost.
Technical solution proposed by the invention is such:
a kind of leakage protecting plug, comprise shell and latch, phase line, zero line, ground wire, the zero sequence current mutual inductor that phase line and zero line all pass, the test loop, electromagnetic trip and locker, this electromagnetic trip and locker comprise solenoid and drive circuit thereof, contact, spring, push rod resets, the drive circuit of described solenoid is mainly by rectification circuit, controllable silicon and the 1st amplifying circuit form, also be provided with the weak current inductor, described weak current inductor is provided with iron core, armature winding and secondary winding, described weak current inductor armature winding and described weak current inductor secondary winding are all on described weak current inductor iron core, between described weak current inductor armature winding and secondary winding, insulation separately, be connected with the detection loop that is in series by described weak current inductor armature winding and current limliting Resistor-Capacitor Unit between ground wire and zero line, also be provided with the 2nd amplifying circuit in the drive circuit of described solenoid, described zero sequence current mutual inductor secondary winding output is connected in parallel with described the 1st input amplifier respectively, described weak current inductor secondary winding output the respectively with 2nd input amplifier is connected in parallel, described the 1st amplifying circuit trigger output and the 2nd amplifying circuit trigger output respectively after series diode be connected the controllable silicon trigger electrode and be connected, described controllable silicon anode and negative electrode respectively be connected the rectification circuit output end positive pole and be connected with negative pole.
Described current limliting Resistor-Capacitor Unit is resistance or electric capacity or resistance and capacitance component.
Described weak current inductor iron core is made by permalloy or amorphous alloy or ultramicro-crystal alloy material.
Described weak current inductor armature winding and current limliting Resistor-Capacitor Unit are in series detection loop is connected between the ground wire of power end and zero line or is connected between the ground wire and zero line of load end.
substantive features of the present invention are can detect the load phase except the same with the leakage protecting plug of prior art, whether chargedly have or not residual current between zero line and detect ground wire, work as phase, move immediately mutually with the ground wire Shi Douhui that breaks down respectively or simultaneously between zero line, zero, outside ground wire all disconnects, be that also leakage protecting plug of the present invention is provided with the detection loop that is in series by weak current inductor and current limliting Resistor-Capacitor Unit between ground wire and zero line, and the detection of weak current inductor, induction output and the detection that triggers silicon controlled circuit and zero sequence current mutual inductor, induction is exported independently to divide with triggering silicon controlled circuit and is arranged, when detecting also can not cause when inductor has signal output simultaneously, weak current inductor and zero-sequence current interact like this, when causing the ground wire accident, the ground protection system exception is with upper dangerous voltage or when the electric leakage of ground protection system earth disappearance and consuming device causes on exposed metal parts and ground tape dangerous voltage, it can detect automatically, the induction output signal also threads off leakage protecting plug automatically, phase line, zero line, ground wire disconnects, thereby realized human body or livestock touch these with on before the exposed metal parts of dangerous voltage just phase line, zero line, ground wire disconnects entirely.
Compared with prior art, the present invention has following remarkable result:
(1), leakage protecting plug of the present invention is owing to being connected with the detection loop that is composed in series by weak current inductor armature winding and current limliting Resistor-Capacitor Unit between ground wire and zero line, when in use, in case leakage protecting plug load end phase, when the consuming device fault electric leakage on zero line and ground protection system's ground wire disappearance (for example: the virtual connection of socket ground wire causes without ground connection), the metal parts that consuming device exposes and leakage protecting plug ground wire all can be with dangerous voltage, the weak current inductor will detect, induction and output signal, make the leakage protecting plug just can be in time phase line before human body or livestock touch consuming device, zero line and ground wire disconnect entirely, it must human body when this situation than existing leakage protecting plug or livestock touch and flow through could thread off after residual current better technical solution is provided, therefore it is more safer than existing leakage protecting plug.
(2), leakage protecting plug of the present invention is owing to being connected with the detection loop that is composed in series by weak current inductor armature winding and current limliting Resistor-Capacitor Unit between ground wire and zero line, when in use, when in case the ground protection system exception causes the ground wire accident to be with dangerous voltage, the weak current inductor will detect, induction and output signal, make the leakage protecting plug just can be in time phase line before human body or livestock touch electrical equipment, zero line and ground wire disconnect entirely, it must human body when this situation than existing leakage protecting plug or livestock touch and flow through could thread off after the unexpected electric current of ground wire better technical solution is provided, therefore it is more safer than existing leakage protecting plug.
(3), leakage protecting plug of the present invention is because the weak current inductor armature winding that is connected between ground wire and zero line also can detect the low current signal that flows through it, induction and output signal, and this armature winding is without the restriction of minimum starting voltage, so it to ground wire with voltage height unrestricted, reach as long as flow through the electric current of weak current inductor armature winding the threshold values (for example: 10 microamperes) that presets, leakage protecting plug of the present invention will be threaded off, therefore it not only ground wire (or consuming device exposed metal parts) with dangerous voltage highly can thread off during for 250V, and ground wire with voltage (or lower when being low to moderate predetermined 36V safe voltage, for example: 24V) also can reliably thread off, when ground wire with voltage during lower than predetermined 36V safe voltage, it does not just need to thread off to avoid misoperation, the voltage range that it can shield is wide, so, leakage protecting plug of the present invention not only uses well, and safety and reliability.
(4), leakage protecting plug of the present invention also can be threaded off when the phase line of power end and zero line reversal connection automatically; can not reset; only have the wiring state of supply socket phase line and zero line is corrected and just can come into operation later; forcibly standard the user side supply socket wiring requirement that must meet national regulation connect, in case other contingencies occur when using.
(5), leakage protecting plug of the present invention the detection of weak current inductor, induction output and trigger that the silicon controlled circuit detects with zero sequence current mutual inductor, induction output and triggering silicon controlled circuit independently divide and be arranged; when detecting also can not cause when inductor has signal output simultaneously, weak current inductor and zero-sequence current interfere with each other like this; also solved simultaneously when sharing and caused when an amplifying circuit lost efficacy the creepage protection function of consuming device and the problem that the unexpected charged defencive function of ground wire was lost efficacy simultaneously, thus safer and reliable.
(6) leakage protecting plug of the present invention has utilized controllable silicon dexterously; only just can realize the detection of weak current inductor, induction exports and triggered silicon controlled circuit and zero sequence current mutual inductor detection, respond to and export and trigger the purpose that the silicon controlled circuit separates with a controllable silicon, so not only can separate processing to two paths of signals but also provide cost savings.
(7) leakage protecting plug of the present invention need not arrange ground wire electrified detection inductor or the instrument transformer that ground wire passes on ground wire, and ground wire, phase line and zero line also need not pass the weak current inductor, therefore can be convenient to produce and save cost.
Leakage protecting plug of the present invention is mainly used on the earth leakage protective of various household electrical appliance.
Description of drawings
Fig. 1 is the leakage protecting plug electrical principle schematic diagram of one embodiment of the invention.
Embodiment
By following embodiment, the present invention is further elaborated.
Shown in Figure 1, a kind of leakage protecting plug mainly by plug body and phase, zero, phase line 5, zero line 6, ground wire 7, rectification circuit 12, controllable silicon 13, the 1st amplifying circuit 14, the 2nd amplifying circuit 19, zero sequence current mutual inductor 15, test loop 16, weak current inductor 18, current limliting Resistor-Capacitor Unit 17, phase line 8, zero line 9, ground wire 10, diode 20 and 21, electromagnetic trip and the locker of load end of three utmost point latches, power end form.Electromagnetic trip and locker mainly are comprised of solenoid 11 and drive circuit, phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4, spring, the push rod that resets.Zero sequence current mutual inductor 15 secondary winding output the respectively with 1st amplifying circuit 14 inputs are connected in parallel, weak current inductor 18 armature windings be connected between the ground wire 7 and zero line 6 of power end after current limliting Resistor-Capacitor Unit 17 is connected, weak current inductor 18 secondary winding output the respectively with 2nd amplifying circuit 19 inputs are connected in parallel, and the 1st amplifying circuit 14 triggers outputs and the 2nd amplifying circuit 19 and triggers outputs and distinguish series diodes 21 and all are connected trigger electrode with controllable silicon and are connected afterwards with 20.
In the present embodiment, current limliting Resistor-Capacitor Unit 17 is resistance, also can adopt electric capacity or resistance and capacitance component, the iron core of weak current inductor 18 adopts the permalloy material to make, also can adopt amorphous alloy or ultramicro-crystal alloy material to make, weak current inductor 18 armature windings and current limliting Resistor-Capacitor Unit 17 are in series detection loop is connected between the ground wire 7 and zero line 6 of power end, also can detect this between ground wire 10 and zero line 9 that loop is connected to load end.
during use, the push rod that resets of leakage protecting plug is pressed, phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2 and ground wire contact 3 and 4 are all normally connected, the phase line 8 of load end, zero line 9, ground wire 10 respectively with the phase line 5 of power end, zero line 6, ground wire 7 is connected, ground wire 7 and 10 effects due to ground connection are clamped at about zero volt voltage, zero line 6 and 9 is also in the zero volt left and right simultaneously, being connected to like this ground wire 7 of leakage protecting plug power end and weak current inductor 18 armature windings between zero line 6 does not just have the electric current that electric current flows through or flows through not reach the threshold values (for example: 10 microamperes) that presets, leakage protecting plug just remains on the "on" position that resets like this, thereby for the consuming device of its lower end is powered and ground connection is provided.
during use, if the phase line of load end 8, consuming device fault on zero line 9 electric leakage and in the normal situation of ground protection system the time, can produce a residual current through ground wire 10 and 7, zero sequence current mutual inductor 15 can detect phase, residual current between zero line is also exported a signal to the 1st amplifying circuit 14, and when residual current reaches predefined threshold values (for example: 10 milliamperes), the 1st amplifying circuit 14 output signals make the oppositely cut-off of diode 21 conducting diodes 20, thereby trigger controllable silicon 13 conductings, leakage protecting plug is threaded off, just can be in time phase line contact 1-1 and 2-1 before people touch consuming device, zero line contact 1-2 and 2-2, ground wire contact 3 and 4 all disconnects, if and the phase line 8 of load end, consuming device fault on zero line 9 electric leakage and in the ground protection system during without ground connection (for example: on socket, the ground wire virtual connection causes without ground connection), the metal parts that consuming device exposes and leakage protecting plug ground wire 10 and 7 all can be with dangerous voltage, being connected to weak current inductor 18 armature windings between leakage protecting plug power end ground wire 7 and zero line 6 just has a weak current and flows through, weak current inductor 18 secondary winding can be exported a signal to the 2nd amplifying circuit 19, and when weak current reaches predefined threshold values (for example: 10 microamperes), the 2nd amplifying circuit 19 output signals make the oppositely cut-off of diode 20 conducting diodes 21, thereby trigger controllable silicon 13 conductings, leakage protecting plug is threaded off, just can be in time phase line contact 1-1 and 2-1 before people touch consuming device, zero line contact 1-2 and 2-2, ground wire contact 3 and 4 all disconnects, thereby protected better people's Electrical Safety.
during use, if ground protection system abnormal causes ground wire 7 and 10 accidents to be with dangerous voltage, being connected to like this ground wire 7 of power end and weak current inductor 18 armature windings between zero line 6 just has a weak current and flows through, signal of weak current inductor 18 secondary winding outputs amplifies for the 2nd amplifying circuit 19, and when weak current reaches predefined threshold values (for example: 10 microamperes), the 2nd amplifying circuit 19 output signals make the oppositely cut-off of diode 20 conducting diodes 21, thereby trigger controllable silicon 13 conductings, leakage protecting plug is threaded off, just can be in time phase line contact 1-1 and 2-1 before people touch consuming device, zero line contact 1-2 and 2-2, ground wire contact 3 and 4 all disconnects, thereby protected better people's safety.
during use, if the phase line of load end 8, the electric leakage of consuming device fault on zero line 9 and ground protection system exception cause ground wire 7 and 10 accident is charged when occuring simultaneously, zero sequence current mutual inductor 15 secondary winding can be exported a signal to the 1st amplifying circuit 14, and when reaching the threshold values that presets, signal of the 1st amplifying circuit 14 outputs makes diode 21 conductings, similarly, weak current inductor 18 secondary winding also can be exported a signal to the 2nd amplifying circuit 19, and when reaching the threshold values that presets, the 2nd amplifying circuit 19 triggers signal of output output and makes diode 20 conductings, this two paths of signals will be respectively or rear triggering the 2nd controllable silicon 13 conductings that are superimposed simultaneously, so just reached as long as when the arbitrary road in the 1st amplifying circuit 14 or the 2nd amplifying circuit 19 has signal output to make diode current flow, all can trigger controllable silicon 13 threads off leakage protecting plug, and the detection of two paths of signals, induction output and triggering silicon controlled process are independently separated again, do not interfere with one another thereby make between them, thereby ensured better people's safety and improved reliability.
Claims (4)
1. leakage protecting plug, comprise shell and latch, phase line, zero line, ground wire, the zero sequence current mutual inductor that phase line and zero line all pass, the test loop, electromagnetic trip and locker, this electromagnetic trip and locker comprise solenoid and drive circuit thereof, contact, spring, push rod resets, the drive circuit of described solenoid is mainly by rectification circuit, controllable silicon and the 1st amplifying circuit form, it is characterized in that: also be provided with the weak current inductor, described weak current inductor is provided with iron core, armature winding and secondary winding, described weak current inductor armature winding and described weak current inductor secondary winding are all on described weak current inductor iron core, between described weak current inductor armature winding and secondary winding, insulation separately, be connected with the detection loop that is in series by described weak current inductor armature winding and current limliting Resistor-Capacitor Unit between ground wire and zero line, also be provided with the 2nd amplifying circuit in the drive circuit of described solenoid, described zero sequence current mutual inductor secondary winding output is connected in parallel with described the 1st input amplifier respectively, described weak current inductor secondary winding output the respectively with 2nd input amplifier is connected in parallel, described the 1st amplifying circuit trigger output and the 2nd amplifying circuit trigger output respectively after series diode be connected the controllable silicon trigger electrode and be connected, described controllable silicon anode and negative electrode respectively be connected the rectification circuit output end positive pole and be connected with negative pole.
2. leakage protecting plug according to claim 1, it is characterized in that: described current limliting Resistor-Capacitor Unit is resistance or electric capacity or resistance and capacitance component.
3. leakage protecting plug according to claim 1 is characterized in that: described weak current inductor iron core is made by permalloy or amorphous alloy or ultramicro-crystal alloy material.
4. leakage protecting plug according to claim 1 is characterized in that: described weak current inductor armature winding and current limliting Resistor-Capacitor Unit are in series detection loop is connected between the ground wire of power end and zero line or is connected between the ground wire and zero line of load end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110225873 CN102364762B (en) | 2011-08-09 | 2011-08-09 | Leakage protection plug |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110225873 CN102364762B (en) | 2011-08-09 | 2011-08-09 | Leakage protection plug |
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| CN102364762A CN102364762A (en) | 2012-02-29 |
| CN102364762B true CN102364762B (en) | 2013-06-26 |
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| CN 201110225873 Active CN102364762B (en) | 2011-08-09 | 2011-08-09 | Leakage protection plug |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022970B (en) * | 2011-09-23 | 2018-05-22 | 钱加灿 | Tape voltage protection with sensitivity |
| CN102842889B (en) * | 2012-08-14 | 2016-02-17 | 钱加灿 | One is tape voltage protection with sensitivity |
| CN105514722A (en) * | 2016-02-19 | 2016-04-20 | 佛山市新基德电子厂有限公司 | Electric leakage protection plug |
| CN107017603B (en) * | 2017-03-10 | 2020-02-21 | 浙江工商职业技术学院 | Intelligent grounding protection device and control method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1350352A (en) * | 2001-11-01 | 2002-05-22 | 刘锦泰 | Leakage protection plug |
| CN102064522A (en) * | 2011-01-24 | 2011-05-18 | 中山市开普电器有限公司 | Novel leakage protector |
| CN202142735U (en) * | 2011-08-09 | 2012-02-08 | 刘睿刚 | Electric leakage protection plug |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201018265Y (en) * | 2007-01-01 | 2008-02-06 | 章祖德 | Electronic control apparatus used for electric leakage protection |
| CN201781263U (en) * | 2010-05-10 | 2011-03-30 | 厦门振泰成科技有限公司 | Electric-shock protection wall overcurrent leakage protection circuit of wall switch |
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2011
- 2011-08-09 CN CN 201110225873 patent/CN102364762B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1350352A (en) * | 2001-11-01 | 2002-05-22 | 刘锦泰 | Leakage protection plug |
| CN102064522A (en) * | 2011-01-24 | 2011-05-18 | 中山市开普电器有限公司 | Novel leakage protector |
| CN202142735U (en) * | 2011-08-09 | 2012-02-08 | 刘睿刚 | Electric leakage protection plug |
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| CN102364762A (en) | 2012-02-29 |
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